a) A State Highway Patrol periodically samples vehicle speeds at various locations on a particular roadway. The sample of vehicle speeds is used to test the hypothesis Ho: u 75. The locations where H0 is rejected are deemed the best locations for radar traps. At Location F, a sample of 64 vehicles shows a mean speed of 76.2 mph with a standard deviation of 5.2 mph. What would be the value of test statistics?

Select one:

a.1.749

b.2.286

c.2.235

d.1.846

b) A thesis student of Xiamen University wanted to study the effect of gender on stating salary and she randomly sampled 30 graduates from SEM. If the thesis student wants to show statistically that the male SEM graduates have a significantly higher mean starting salary than the female SEM graduates. Which of the following is an appropriate alternative hypothesis?

Select one:

a.Ha:umales =ufemales

b.Ha:umales ufemales

c.Ha:umales >ufemales

d.Ha:umales <ufemales

c) thesis student of Xiamen University wanted to study the effect of gender on stating salary and she randomly sampled 30 graduates from SEM. The sample statistics are: Sample 1 (Male): Sample size = 12; Sample mean= RM 105820 and Sample standard deviation= 11741and Sample 2 (Female): Sample size = 18; Sample mean= RM 99210 and Sample standard deviation= 13577. What assumptions are necessary to conduct this hypothesis test?

Select one:

a.The population variances are approximately equal.

b.The samples were randomly and independently selected.

c.Both populations of salaries (male and female) must have approximate normal distributions.

d.All of the given assumptions were necessary.

D) A thesis student of Xiamen University wanted to study the effect of gender on stating salary and she randomly sampled 30 graduates from SEM. The sample statistics are: Sample 1 (Male): Sample size = 12; Sample mean= RM 105820 and Sample standard deviation= 11741and Sample 2 (Female): Sample size = 18; Sample mean= RM 99210 and Sample standard deviation= 13577. What would be the critical value at the alpha=0.10?

Select one:

a.1.315

b.1.316

c.1.706

d.1.708

E) A thesis student of Xiamen University wanted to study the effect of gender on stating salary and she randomly sampled 30 graduates from SEM. The sample statistics are: Sample 1 (Male): Sample size = 12; Sample mean= RM 105820 and Sample standard deviation= 11741and Sample 2 (Female): Sample size = 18; Sample mean= RM 99210 and Sample standard deviation= 13577. If the thesis student wants to show statistically that the male SEM graduates have a significantly higher mean starting salary than the female SEM graduates. The proper conclusion for this test is:

Select one:

a.at the Alpha = 0.05 level, there is sufficient evidence to indicate that females have a lower mean starting salary than male SEM graduates.

b.at the Alpha= 0.05 level, there is sufficient evidence to indicate a difference in the mean starting salaries of male and female SEM graduates.

c.at the Alpha = 0.05 level, there is insufficient evidence to indicate any difference in the mean starting salaries of male and female SEM graduates.

d.at the Alpha = 0.05 level, there is sufficient evidence to indicate that females have a higher mean starting salary than male SEM graduates.

F) A Type I error is defined as

Select one:

a.When a true null hypothesis is not rejected.

b.When a true null hypothesis is rejected.

c.When a null hypothesis is rejected that is false.

d.When a null hypothesis is not rejected that is false.

G) Adding independent variables with the model

Select one:

a.reduce the sum of squares due to error (SSE).

b.the sum of squares due to error (SSE) may increase or decrease.

c.increase the sum of squares due to error (SSE).

d.no effect on the sum of squares due to error (SSE).

H) Adjusted R squared in multiple regression

Select one:

a.Is always positive

b.can be more than 1.

c.Can be positive or negative

d.Is always negative